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Note Regulatory capital requirements (Capital Requirements Basel 3) (Detail) - Basel III | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |
Tier 1 Common Equity to be Well Capitalized to Risk Weighted Assets |  |  |  |  | 6.50%
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets |  |  |  |  | 8.00%
Capital Required to be Well Capitalized to Risk Weighted Assets |  |  |  | 10.00% | 10.00%
Tier One Leverage Capital Required to be Well Capitalized to Average Assets |  |  |  |  | 5.00%
Standardized approach |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |
Tier 1 Common Equity to be Well Capitalized to Risk Weighted Assets |  |  |  | 6.50% |
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets |  |  |  | 8.00% |
Capital Required to be Well Capitalized to Risk Weighted Assets |  |  |  | 10.00% |
Tier One Leverage Capital Required to be Well Capitalized to Average Assets |  |  |  | 5.00% |
Common Equity Tier 1 Based Capital Minimum Requirement Ratio |  |  |  | 4.50% |
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets |  |  |  | 6.00% |
Capital Required for Capital Adequacy to Risk Weighted Assets |  |  |  | 8.00% |
Minimum Capital Plus - Leverage Ratio |  |  |  | 4.00% |
Standardized approach | Capital Adequacy Minimum Requirement Plus Capital Conservation Buffer/Basel III |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |
Tier 1 Common Equity to be Well Capitalized to Risk Weighted Assets | 7.00% | 7.00% | 7.00% | 6.375% |
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets | 8.50% | 8.50% | 8.50% | 7.875% |
Capital Required for Capital Adequacy to Risk Weighted Assets | 10.50% | 10.50% | 10.50% | 9.875% |

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- Definition The amount of Common Equity Tier 1 Risk Based Capital minimum ratio requirement under the regulatory framework of Basel 3. + References No definition available. + Details
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- Definition The Tier 1 common equity capital ratio (Tier 1 common equity divided by risk weighted assets) required to be categorized as "well capitalized", in the regulatory framework for prompt corrective action. + References No definition available. + Details
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- Definition The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 + Details
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- Definition The Total risk based capital ratio (total capital divided by risk weighted assets) required to be categorized as "well capitalized", in the regulatory framework for prompt corrective action. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 + Details
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- Definition The minimum amount of Tier 1 Leverage Capital for capital adequacy purposes divided by average assets as defined in the regulations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 + Details
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- Definition The amount of Tier 1 Leverage Capital required to be categorized as well capitalized divided by average assets as defined in the regulatory framework for prompt corrective action. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 + Details
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- Definition The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 + Details
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